diff --git a/src/particle.cpp b/src/particle.cpp
index b6e936b62..26caea2f3 100644
--- a/src/particle.cpp
+++ b/src/particle.cpp
@@ -422,8 +422,8 @@ Particle::cross_surface()
     site.delayed_group = this->delayed_group_;
     site.surf_num = surf->id_;
     site.particle = this->type_;
-    // site.parent_id = this->id_;
-    // site.progeny_id = this->n_progeny_;
+    site.parent_id = this->id_;
+    site.progeny_id = this->n_progeny_;
     int64_t idx = simulation::surf_src_bank.thread_safe_append(site);
   }
 
diff --git a/src/simulation.cpp b/src/simulation.cpp
index 3801a0263..f950fa71c 100644
--- a/src/simulation.cpp
+++ b/src/simulation.cpp
@@ -461,7 +461,7 @@ void initialize_history(Particle& p, int64_t index_source)
 {
   // set defaults
   if (settings::run_mode == RunMode::EIGENVALUE || settings::surf_src_read) {
-    // set defaults for eigenvalue simulations from primary bank
+    // set defaults for eigenvalue simulations and surface source reading from primary bank
     p.from_source(&simulation::source_bank[index_source - 1]);
   } else if (settings::run_mode == RunMode::FIXED_SOURCE) {
     // initialize random number seed